Figure 3

Frequency of pilus island (PI) types by clonal complexes (CCs). All 295 stains were screened for the presence of PI-1, PI-2a, and PI-2b using multiplex PCR. The frequency of each PI is illustrated across CCs, which are listed in tree order as determined using the Neighbor-Joining method (Figure 1). Strains representing STs that did not belong to one of the seven CCs were combined into a group of singletons.